JP2937494B2 - Golf ball - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf ball, and more particularly to a golf ball having improved dimple shapes to improve the flight performance by disrupting the flow of air around the golf ball during flight.

[0002]

2. Description of the Related Art Generally, 280
From 540 dimples are provided. The role of the dimples during the flight of the golf ball is to disturb the flow of air around the golf ball, thereby promoting turbulent transition of the boundary layer, and causing turbulent separation, lowering the separation point backward, There are two points, that is, the point that the pressure resistance is reduced and the point that the lift is improved by promoting the vertical difference between the peeling points. Therefore, it can be said that dimples that can further disturb the flow of air around the golf ball are more excellent in aerodynamics.

[0003] In view of the role of the above-mentioned dimples, conventionally, a combination of dimples of various shapes has been proposed to disrupt the flow of air around a golf ball. For example, a dimple having a pentagonal or hexagonal surface shape (Japanese Patent Application Laid-Open No. 48-19325) and a dimple having two types of large and small circular dimples having different diameters (Japanese Patent Application Laid-Open No.
2-79072) and a combination of circular dimples and non-circular dimples (JP-A-64-8982). In the above conventional example, for example, JP-A-48-19325, dimples having different surface shapes and non-adjacent dimples account for about 71%.

[0004]

However, the dimples proposed in the prior art described above do not have a sufficient effect of disturbing the flow of air around the golf ball. Therefore, a golf ball having the dimple has a desired flight distance. I couldn't get it.

The present invention has been made in view of the above problems, and by improving dimples, the effect of disturbing the flow of air around the golf ball, which is the role of the dimples, is increased, and the flight distance of the golf ball is increased. The purpose is to do so.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a golf ball with a combination of circular and regular polygonal dimples, or regular polygonal dimples having different numbers of sides. The present invention provides a golf ball characterized by providing a plurality of types of dimples having different surface shapes each comprising a combination of (i), wherein the number of dimples not entirely adjacent to dimples having different surface shapes is less than 30% of the total number of dimples. is there.

The surface shape of the dimple is the shape of the dimple as viewed from the direction normal to the spherical surface of the golf ball, and the shape of the dimple is a circle or a regular polygon. As described above, a combination of a plurality of types of dimples having different shapes is a combination of circular dimples and regular polygonal dimples or a combination of regular polygons having different numbers of sides. Therefore, for example, it is composed of a combination of circular dimples and regular octagonal dimples, a combination of regular square dimples and regular hexagonal dimples, and the like.

The reason why the surface shape of the dimple is circular or regular polygon as described above is that almost the same dimple effect can be obtained irrespective of the direction of the backspin during flight of the golf ball. is there.

In the present invention, when the surface shape of the dimple is called a regular polygon, the shape is not strictly a regular polygon because the surface of the golf ball is a curved surface and one side of the dimple is a curved line. However, in the present invention, the above-described shape is also regarded as a regular polygonal dimple because it is regarded as being approximately a regular polygon.

Further, circular dimples having different diameters or square dimples having different lengths on one side are respectively different types of dimples, but have the same surface shape. Since they are the same in that they are circular or square, they are regarded as dimples having the same surface shape in the present invention, and are not regarded as dimples having different surface shapes.

The above-mentioned adjacent dimple is a state in which a straight line connecting the centers of the dimples does not intersect with other dimples, and the distance between the centers of the dimples (the length of the straight line) is 6.5 mm or less. pointing.

[0012]

As described above, since the dimples provided on the spherical surface of the golf ball are provided to increase the flight distance by disturbing the flow of air around the golf ball, the dimple effect increases as the surface shape of the adjacent dimples differs. Is big. Therefore, it is preferable that the number of dimples having different surface shapes adjacent to one dimple is large, and in the present invention,
Since dimples that are not completely adjacent to dimples having different surface shapes are less than 30% of the total number of dimples, as many dimples having different surface shapes as possible are adjacent to each other.
Turbulence of the air around the golf ball is promoted, and the flight distance of the golf ball can be extended. If it exceeds 30%, the effect of disturbing the flow of air around the golf ball is not sufficient, and a desired flight distance cannot be obtained.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the golf ball according to the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a first embodiment of a golf ball according to the present invention. The spherical surface of the golf ball includes dimples A having a regular square surface and dimples B having a regular hexagonal surface. Provided. Each of the dimples A is set so as to be adjacent to at least one dimple B, and dimples A that are not at all adjacent to the dimples B having different surface shapes are zero. When viewed from the side of the dimple B, the dimple B having no surface adjacent to the dimple A having a different surface shape is zero.

As shown in FIG. 3, for example, a straight line L connecting the center O of the dimple 1 and the center O ′ of the dimple 2 is defined as the adjacent dimples as shown in FIG.
And the distance of the straight line L is 6.5 mm or less. Therefore, in FIG. 3, if the length L is 6.5 mm or less, the dimples 1 and 2 are adjacent dimples, but if the length L is 6.5 mm or more, the dimples 1 and 2 are adjacent. Not a dimple.
Further, as shown in FIG. 4, the straight line L connecting the centers of the dimples 1 'and 2' intersects with the other dimples 3 ', so that the dimples 1' and 2 'are not adjacent dimples.

In the golf ball of the first embodiment shown in FIGS. 1 and 2, the square dimple A has the longest diagonal length (hereinafter referred to as the regular polygon dimple length). ) Is 4.10 mm, and the total number of the dimples A is 216. The regular hexagonal dimple B has a dimple length of 3.70 mm and a total number of 120 dimples B.

FIGS. 5 and 6 show a golf ball according to a second embodiment of the present invention, in which dimples C having a circular surface shape and dimples D having a regular octagonal surface shape are provided. The circular dimple C is the dimple length.
(Diameter of the circle) is 3.50 mm, and the total number is 202. The regular octagonal dimple D has a dimple length of 3.50 mm and a total number of 130 dimples.

In the golf ball of the second embodiment, all the regular octagonal dimples D are adjacent to at least one circular dimple C, and the dimples D having no surface adjacent to the dimples C having different surface shapes are zero. On the other hand, 202 circular dimples C are one of them.
32 dimples C are adjacent to regular octagonal dimples D, and the remaining 70 dimples C are not adjacent to D at all. That is, in the golf ball of the second embodiment, 70 dimples, which is about 21% of the total 332 dimples, are dimples that are not completely adjacent to dimples having different surface shapes.

The golf balls of the first comparative example and the second comparative example corresponding to the golf balls of the first embodiment and the second embodiment are prepared, and the flight distance effect of the golf ball according to the present invention is compared with that of the comparative example. A comparative test was performed. Table 1 shows the dimple specifications of the first and second examples and the first and second comparative examples.
Shown in

[0019]

[Table 1]

The golf ball of the first comparative example is shown in FIG. 7 and FIG. 8, and as shown in Table 1 and shown in FIG. And dimple F. The dimples E are all adjacent to at least one dimple F, and similarly, the dimples F are all adjacent to at least one dimple E. The total number of dimples of the golf ball of the first comparative example is the same as the golf ball of the first embodiment,
The positions of the dimples are also substantially the same as the positions of the dimples of the golf ball of the first embodiment.

The golf ball of the second comparative example is shown in FIGS. 9 and 10. As shown in FIG. 1 and shown in FIG. 1, the golf ball is composed of one kind of dimple G having a regular hexagonal surface. The total number of dimples of the golf ball of the second comparative example is the same as the total number of dimples of the golf ball of the second embodiment,
The positions of the dimples are the same as those of the golf ball of the second embodiment.

The golf balls of the first and second embodiments and the first and second comparative examples are thread-wound balls having a balata cover and a liquid center, and have the same structure and composition. The outer diameter is 42.70 ± 0.0
It is unified to 3 mm and the compression is unified to 95 ± 2.

Hereinafter, experimental examples of the first and second examples and the first and second comparative examples will be described. The golf balls of the first and second embodiments and the first and second comparative examples are driven by a driver using a swing robot manufactured by Tsurutemper.
At (W1), a flight distance test was performed under the conditions of a head speed of 45 m / s. The machine conditions were adjusted so that the spin was 3500 ± 300 rpm and the ball launch angle was 10 ± 0.5 degrees. Table 2 below shows the average of the results of experiments for 20 balls.

[0024]

[Table 2]

From the results shown in Table 2, the golf balls of the first and second embodiments according to the present invention are larger in both carry and total compared to the golf balls of the first and second comparative examples, and are more likely to fly well. It has been proven.

[0026]

As is apparent from the above description, in the golf ball according to the present invention, as many dimples having different surface shapes are adjacent to each other as possible, the turbulence of the air flow around the golf ball is promoted. Thus, the flight distance of the golf ball can be increased.

[Brief description of the drawings]

FIG. 1 is a front view of a golf ball according to a first embodiment of the present invention.

FIG. 2 is a plan view of the golf ball of the first embodiment.

FIG. 3 is a schematic diagram for explaining adjacent dimples.

FIG. 4

FIG. 5 is a front view of a golf ball according to a second embodiment of the present invention.

FIG. 6 is a plan view of the golf ball of the second embodiment.

FIG. 7 is a front view of a golf ball of a first comparative example.

FIG. 8 is a plan view of the golf ball of the first comparative example.

FIG. 9 is a front view of a golf ball of a second comparative example.

FIG. 10 is a plan view of the golf ball of the second comparative example.

[Explanation of symbols]

 A dimple B dimple C dimple D dimple

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A63B 37/00

Claims (1)

(57) [Claims] 1. A spherical surface of a golf ball is provided with a plurality of types of dimples having different surface shapes each comprising a combination of circular and regular polygonal dimples or a combination of regular polygonal dimples having different numbers of sides. A golf ball, wherein the number of dimples that are not completely adjacent to dimples having different surface shapes is less than 30% of the total number of dimples.